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Ethercat Lxm32m movevelocity speed control overshoot every 5 seconds

mATTO
2018-05-09
2023-08-17
  • mATTO - 2018-05-09

    Hello, I have RPI-1 B @ 1000 MHz frequency

    Linux raspberrypi 4.4.9-rt17+ #2 PREEMPT RT Thu May 12 00:18:09 CEST 2016 armv6l GNU/Linux

    CODESYS Control for Raspberry PI 3.5.12.10

    when the axis is running in continous_motion with mc_movevelocity, speed overshoot occurs every 5 seconds, I cannot find the cause, seeking it sinve 3 days

    thank you in advance for your help

    BR Ozcan

    IMG: 180509_Ethercat_LXM32M.PNG

     
  • josepmariarams - 2018-05-09

    Have you enabled dc clock?

     
  • mATTO - 2018-05-10

    Josep M. Rams hat geschrieben:
    Have you enabled dc clock?

    Of course Josep dc clock is enabled, if not the communication will be problematic

     
  • eschwellinger

    eschwellinger - 2018-05-10

    Hi,
    do you see this 5s peaks in the cyclic tests of rt_preempt too?

    BR
    Edwin

     
  • mATTO - 2018-05-11

    it's very interesting, when rt-tests is running it never occurs but when the test is finished, speed overshoot starts again

    IMG: htop.PNG

    IMG: rt_tests.PNG

     
  • josepmariarams - 2018-05-12

    The cpu works at fixed frequency?

    Enviat des del meu Aquaris M5.5 usant Tapatalk

     

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